An endocytosis defect as a possible cause of proteinuria in polycystic kidney disease.
An endocytosis defect as a possible cause of proteinuria in polycystic kidney disease.
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内吞作用缺陷可能是多囊肾病蛋白尿的原因。
DOI:
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发表时间:
2001
期刊:
影响因子:
--
通讯作者:
R. Witzgall
中科院分区:
文献类型:
--
作者:
N. Obermüller;B. Kränzlin;W. Blum;N. Gretz;R. Witzgall
Because proteinuria has been demonstrated in patients with autosomal-dominant polycystic kidney disease (ADPKD), we have investigated whether proteinuria also occurs in the (cy/+) rat, a widely used model for ADPKD. Increased urinary excretion of proteins, in particular of albumin, can be found in 16-wk-old (cy/+) rats, with a gel electrophoresis pattern compatible with a tubular origin of proteinuria. Using FITC-labeled dextran as an in vivo tracer for renal tubular endosomal function, we could show that portions of cyst-lining epithelia from proximal tubules have lost the ability to endocytose, which is necessary for the reabsorption of low-molecular-weight proteins. By immunohistochemistry, the expression of other proteins implicated in endocytosis, such as the chloride channel ClC-5 and the albumin receptor megalin, correlated well with the presence and absence of FITC-dextran in cysts. As an example of growth factor systems possibly being affected by this endocytosis defect, we could detect increased urinary levels of insulin-like growth factor-I protein in (cy/+) animals. These data indicate that proteinuria and albuminuria in the aforementioned rat model for ADPKD are due to a loss of the endocytic machinery in epithelia of proximal tubular cysts. This may also affect the concentration of different growth factors and hormones in cyst fluids and thus modulate cyst development.
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DOI:
10.1152/ajprenal.1995.268.3.f398
发表时间:
1995-03-01
影响因子:
4.2
作者:
BACHINSKY, DR;SABOLIC, I;PERRONE, RD
通讯作者:
PERRONE, RD
影响因子:
2.9
作者:
Zor, T;Seliger, Z
通讯作者:
Seliger, Z
DOI:
10.1152/ajprenal.1996.271.1.f169
发表时间:
1996-07-01
影响因子:
4.2
作者:
Devuyst, O;Burrow, CR;Wilson, PD
通讯作者:
Wilson, PD
DOI:
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发表时间:
1992
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Willnow,TE;Goldstein,JL;Orth,K;Brown,MS;Herz,J
通讯作者:
Herz,J
DOI:
--
发表时间:
1994-12
期刊:
Journal of the American Society of Nephrology : JASN
影响因子:
--
作者:
Arlene B. Chapman;Ann M. Johnson;P. Gabow;Robert W. Schrier
通讯作者:
Arlene B. Chapman;Ann M. Johnson;P. Gabow;Robert W. Schrier